Night vision devices gather existing ambient light (starlight, moonlight or infra-red light) through the front lens. This light, which is made up of photons goes into a photocathode tube that changes the photons to electrons.
The electrons are then amplified to a much greater number through an electrical and chemical process. The electrons are then hurled against a phosphorus screen that changes the amplified electrons back into visible light that you see through the eyepiece.
The image will now be a clear green-hued amplified re-creation of the scene you were observing.
Arvind Singh
Please have a look at this useful link.
https://www.quora.com/How-does-night-vision-work
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